What is the currency of PORTO?
Excuse me, could you please clarify what the official currency is for the city of Porto? I'm aware that Portugal as a whole uses the Euro as its national currency, but I'm wondering if Porto, being a popular tourist destination, has adopted any local or alternative currencies that are commonly used within the city limits? If so, could you elaborate on what those might be and how they are used? Thank you for your time and assistance.